A5075288562- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Particle accelerators and beam dynamics
- Pulsed Power Technology Applications
- Terahertz technology and applications
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Radio Frequency Integrated Circuit Design
- Plasma Diagnostics and Applications
- Acoustic Wave Resonator Technologies
- Ammonia Synthesis and Nitrogen Reduction
- Superconducting and THz Device Technology
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Magnetic confinement fusion research
- Photonic and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- Millimeter-Wave Propagation and Modeling
- Surface Roughness and Optical Measurements
- Strong Light-Matter Interactions
- Experience-Based Knowledge Management
- Advanced Frequency and Time Standards
- Magnetic and Electromagnetic Effects
- Electromagnetic Compatibility and Measurements
- Optical Coatings and Gratings
Central Electronics Engineering Research Institute
2014-2024
Indian Institute of Technology Kharagpur
2024
Academy of Scientific and Innovative Research
2019-2023
Council of Scientific and Industrial Research
2009-2021
Indian Institute of Technology Roorkee
2018
Seoul National University
2010-2015
Council for Scientific and Industrial Research
2011
This paper presents a three-dimensional (3-D) simulation of triode-type magnetron injection gun (MIG) for 42-GHz 200-kW gyrotron with transverse-to-axial velocity ratio the electron beam at 1.22 and maximum transverse-velocity spread 3.2%. The operating mode is TE_03, it operated in fundamental harmonic. MIG has been designed by using some tradeoff equations 3-D particle-tracing code (computer technology). simulated results have validated obtained OPERA Vector Fields two-dimensional...
Abstract A high‐quality‐factor (high‐Q) metallic Fano metamaterial is demonstrated both experimentally and theoretically. This material suitable for highly efficient Cerenkov lasing in which subwavelength slits are arranged to form asymmetric unit cells. In contrast conventional dielectric or Smith–Purcell devices, the proposed device, convection electrons traverse high‐Q metamaterial. The interplay between an extremely low group velocity from infinite transverse permittivity of anisotropic...
A helix slow-wave structure (SWS) for a high-efficiency (electronic efficiency >; 25%) Ku-band 140-W space traveling-wave tube (TWT) has been designed. The cold circuit parameters of SWS, like propagation constant and on-axis interaction impedance, were determined using 3-D electromagnetic field simulators ANSOFT-HFSS CST-MWS, those validated with the experimental results. in-house developed large-signal code SUNRAY-1D was used to design complete SWS in two sections sever taper achieve...
Metallic metamaterials with positive dielectric responses are promising as an alternative to dielectrics for the generation of Cerenkov radiation [J.-K. So et al., Appl. Phys. Lett. 97(15), 151107 (2010)]. We propose here by theoretical analysis a mechanism couple out from slab surfaces in transverse direction. The proposed method based on Brillouin-zone folding is periodically modify thickness metamaterial axial Moreover, intensity surface-coupled this shows order-of-magnitude enhancement...
Researchers have investigated plasma-related phenomena and internal breakdowns in the gigawatt–terahertz relativistic backward wave oscillator (RBWO) caused by field emissions from surfaces of waveguide circuits these oscillators. In order to increase power-handling capability electron beam devices, an RBWO is proposed form oversized structure which diameter ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
An analysis of the effects electromagnetic pulses from a high-power microwave (HPM) radiation technique is conducted using relativistic backward-wave oscillator (RBWO) which uses electron beams in vacuum circuits. The application described here based on device and to generate radiation. RBWO was fabricated operate region with gamma factor (γ) 2 at an acceleration voltage 500 kV. A mode-converted back-wave antenna that converts TM01 TE11 designed because electric field center circuit null....
Thermal analysis of an <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</i> -band 60-kW (continuous-wave) double-ring strapped magnetron for optimizing the design a cathode support structure and cooling system is presented. This consists oxygen-free copper anode with ten built-in channels directly heated tungsten cathode. The operating temperature greater than 2000°C; therefore, proper thermal essential reliable operation. heat convection...
A triode type magnetron injection gun (MIG) shown in Fig. 1 for a 200 kW, 42 GHz gyrotron has been designed. Operating voltage of modulating anode is 29 KV and accelerating 65 KV. Operation mode this TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">03</sub> it would be used TOKAMAK system plasma heating. This MIG designed by using commercially available code EGUN three house developed software MIGSYN, GINTMESH MIGANS respectively.
This paper presents a novel approach for computation of high-order axial modes (HOAMs) in conventional and uptapered gyrotron resonator. A code has been developed which computes the eigenfrequency, Q-factor field profile HOAMs absence electron beam Cyclic coordinate search method used optimization complex eigenfrequencies, obviates gradients radiation boundary conditions and, hence, reduces computational complexity. have computed resonators operating at 10, 132, 203, 424 GHz, results...
A weakly tapered interaction cavity has been designed to excite TE03 operation mode at the fundamental harmonic number for 42 GHz, 200 kW gyrotron. software code GCAVSYN developed synthesize geometry and selection of operating mode. The cold analysis beam-wave were carried out using commercially available PIC MAGIC. An axial output power above achieved guiding magnetic field 1.61 T.
This article presents the design and analysis of a staggered double-vane (SDV) slow-wave structure (SWS) for W-band amplifier, with 20-dB gain very high bandwidth (~25%). The use dual Bragg reflector at either end interaction increases impedance matching radio frequency (RF) coupling efficiency input output ports, thereby reducing RF leakage electron gun collector ends, from 15% to 25% less than 0.6%. attenuator section is simple fabricate optimally designed in order provide an effective...
The design of 42 GHz, 200 kW Gyrotron has been carried out using in-house and commercially available software's. A triode type MIG designed EGUN code three in house developed codes MIGSYN, GINTMESH MIGANS respectively. weakly tapered interaction cavity to excite TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">03</sub> operation mode. software GCAVSYN synthesize the geometry selection operating cold analysis was PIC MAGIC. An axial output...
Inverse magnetron injection gun (IMIG) provides several advantages over simple MIG especially in high-power, high-frequency gyrotron. Sub-millimeter (>230 GHz), high-power (≥1 MW) gyrotrons would be required futuristic plasma fusion machines to fulfill the need of tens megawatt RF power for electron cyclotron resonance heating. Here, this paper, an IMIG is designed 0.24-THz, 1-MW First, tradeoff design equations and technical constraints are used synthesize electrodes geometry electrical...
A triode type coaxial inverse magnetron injection gun (CIMIG) is designed using the 2-D and 3-D beam trajectory simulation codes for 240-GHz, 2-MW gyrotron. In IMIG, modulating anode adjusted at center of emitter ring it provides compact size better control on instability halo. As per beam-wave interaction simulations, CIMIG to deliver 6.5-MW (100 kV, 65 A) helical electron 8.72-mm guiding radius cavity center. First, synthesis performed estimate a range electrical geometrical parameters...
The coaxial interaction structure for a 0.24-THz, 2-MW gyrotron is designed, and its RF behavior analyzed the beam current of 60 A voltage 90 kV. searching suitable, very high-order TE mode, which satisfies all technical conditions required to generate power, an important critical step in development coaxial-cavity (COCA) gyrotron. detailed analysis mode selection described this article. geometry axially corrugated insert optimized using in-house code COCA. Based on cylindrical cavity,...